Rotary sealing structure of direct-current coreless motor

Abstract

The utility model provides a rotary sealing structure of a direct-current coreless motor, which is applied to the technical field of medical equipment and is characterized in that two ends of the direct-current motor are sealed through a first sealing assembly and a second sealing assembly, dust and water spots are prevented from entering the direct-current motor, and the direct-current motor is provided with a cylindrical pin which is axially inserted into the direct-current motor. The axial movement of the direct current motor is limited, and the sealing performance of the direct current motor during high-speed rotation is further ensured.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and more specifically, to a rotary sealing structure of a DC coreless cup motor. Background Art

[0002] There are nearly 200 million patients with head, neck and ENT diseases in my country each year, and one-fifth of them have to endure repeated and uncured problems. Especially allergic rhinitis, vocal cord polyps, tinnitus, snoring, etc. These diseases are often easily affected by the environment such as temperature; as the macro environment gradually improves, the demand for medical treatment will be restored, or even compensatory growth, which will bring serious surgical treatment pressure to minimally invasive endocavity planing surgery. Current minimally invasive intracavitary planing operating handles usually use high-speed rotating planing knives when cutting diseased tissues in the cavity, wherein a rotating motor is arranged inside the minimally invasive intracavitary planing operating handle to provide the rotating power required by the planing knife. The rotating motor is prone to displacement during high-speed rotation. The sealing assembly used to fix and seal the rotating motor has a complex structure and is relatively large in size, making it inconvenient to install and maintain. A simple structure, such as using a sealing ring to fix the rotating motor inside the handle, will make it difficult to completely limit the displacement of the rotating motor during operation and prevent water stains or dust from entering the rotating motor. For example, the Chinese utility model patent with announcement number CN219763487U proposes using a clamping mechanism to clamp the planing knife, and cooperating with a suction pipe to discharge water to prevent water from scouring the drive motor. At the same time, the drive motor is arranged in a sealed housing, which is connected by a threaded fitting. In fact, in the above method, the use of a clamping mechanism to clamp the planing knife will increase the size of the handle, which is not conducive to the development of a small handle. Moreover, when the rotating motor is running at high speed in the closed housing only through threaded engagement, it is inevitable that it will move due to the influence of the motor torque. The installation of the motor is not stable, and water stains and dust from the outside can easily enter the rotating motor through the gaps between the threads. Therefore, in the prior art minimally invasive internal planing operating handle, the motor lacks a rotating sealing structure that allows the motor to operate stably while also achieving a good sealing function to prevent dust and water stains from entering the motor.

[0003] In view of the above problems, the existing technology needs to be improved urgently. Utility Model Content

[0004] The purpose of the present application is to provide a rotary sealing structure for a DC hollow cup motor, which seals both ends of the DC motor through a first sealing component and a second sealing component to prevent dust and water stains from entering the interior of the DC motor, and by arranging an axially inserted cylindrical pin on the DC motor to limit the axial movement of the DC motor, further ensuring the sealing performance of the DC motor during high-speed rotation.

[0005] In the first aspect, the present application provides a rotary sealing structure of a DC coreless motor, and the technical solution is as follows:

[0006] The DC hollow cup motor at least comprises a DC motor and a hollow shell, wherein the DC motor is axially arranged in the hollow shell, and a rotary sealing structure is arranged between the DC motor and the hollow shell to maintain the sealing performance of the DC motor, comprising:

[0007] A first sealing component and a second sealing component are respectively fixed to two ends of the hollow housing; the first sealing component and the second sealing component are gathered toward the motor shaft of the DC motor and sleeved on the motor shaft to close the gap between the motor shaft and the hollow housing;

[0008] The first sealing assembly at least includes a cylindrical pin inserted into the DC motor along the axial direction, and the surface of the cylindrical pin contacts the hollow housing to limit the axial movement of the DC motor.

[0009] The present application proposes a rotary sealing structure of a DC hollow cup motor. By installing a DC hollow cup motor as the driving motor of a handle, the driving motor of the handle has the characteristics of small size, light weight, high motor efficiency and low energy consumption, and the motor torque of the DC hollow cup is small, which can ensure the efficiency of the motor. The DC hollow cup motor at least includes a DC motor and a hollow shell. The DC motor is axially arranged in the hollow shell. There will be a gap between the motor shaft of the DC motor and the hollow shell. When running at high speed, it is inevitable that there will be movement, and external water stains and dust can easily enter the motor through the gap and corrode the motor. Therefore, a rotary sealing structure can be set between the DC motor and the hollow shell to close the gap between the DC motor and the hollow shell and maintain the sealing performance of the DC motor. Since the DC motor is arranged along the axial direction, there are gaps between its two ends and the hollow shell, so The rotary sealing structure includes a first sealing component and a second sealing component respectively fixed at both ends of the hollow shell, and the first sealing component and the second sealing component gather toward the motor shaft of the DC motor and are sleeved on the motor shaft, so that the first sealing component and the second sealing component form a closed sealing structure, blocking the gap between the DC motor and the hollow shell, ensuring that external water stains and dust cannot enter the DC motor, and the motor shaft is inserted in the first sealing component and the second sealing component, and when the motor shaft rotates at high speed, its radial displacement is limited, ensuring the stability of the DC motor when working; the first sealing component at least includes a cylindrical pin inserted into the DC motor along the axial direction, and the surface of the cylindrical pin contacts the hollow shell. When the DC motor rotates and there is a tendency of axial movement, the friction between the cylindrical pin and the hollow shell will limit the axial movement of the DC motor, further ensuring the stability of the DC motor operation. Therefore, the rotary sealing structure of the DC hollow cup motor has the beneficial effect of ensuring the stable operation of the DC motor while ensuring the sealing of the DC motor.

[0010] Furthermore, the second sealing assembly at least includes a compression spring arranged along the axial direction, and the compression spring is sleeved on the motor shaft to limit the axial movement of the DC motor.

[0011] The present application proposes a rotary sealing structure for a DC hollow cup motor, in which an axially placed compression spring is arranged in the second sealing component, and the compression spring is sleeved on the motor shaft, and is used in conjunction with a cylindrical pin. When the DC motor moves axially, the compression spring can limit the displacement of the DC motor in the axial direction through its own elastic force, thereby further improving the stability of the operation of the DC motor.

[0012] Furthermore, the first sealing assembly also includes a hole elastic retaining ring with a diameter greater than the inner diameter of the hollow shell, and the hole elastic retaining ring is sleeved on the motor shaft to limit the rotational displacement of the DC motor.

[0013] The present application proposes a rotary sealing structure for a DC hollow cup motor, wherein a first sealing component also includes a hole elastic retaining ring having a diameter greater than an inner diameter of a hollow shell, which is restricted in expansion in a radial direction by the hollow shell. The hole elastic retaining ring is sleeved on the motor shaft, and can limit the rotational displacement of the DC motor when the DC motor starts to generate a large torque and has a rotation tendency, thereby preventing the DC motor from rotating as a whole and pulling the cable.

[0014] Furthermore, the first sealing assembly also includes a first sealing mounting portion, which includes a first bearing sleeved on the motor shaft, a first sealing member sleeved on the first bearing, and a mounting member in contact with the inner wall of the hollow shell, the first sealing member is installed in the mounting member, and the first sealing mounting portion is used to close the gap between the motor shaft and the hollow shell.

[0015] The present application proposes a rotary sealing structure for a DC hollow cup motor, wherein the first sealing component also includes a first sealing mounting portion, the first sealing mounting portion includes a first bearing sleeved on the motor shaft, so that the motor shaft can rotate at high speed in the first bearing to prevent the first sealing mounting portion from affecting the operation of the motor shaft, a first sealing member is sleeved on the first bearing to prevent water stains and dust from entering the DC motor, the first sealing member is installed in the mounting member, the mounting member contacts the inner wall of the hollow shell, further closes the gap between the motor shaft and the hollow shell, and improves the sealing of the DC motor.

[0016] Furthermore, the first sealing assembly also includes a first O-ring, which is sleeved on the first sealing mounting portion and contacts the inner wall of the hollow shell.

[0017] Furthermore, the first sealing assembly also includes a gasket, which is arranged between the first sealing mounting portion and the elastic retaining ring for the hole and is used to seal the gap between the first sealing mounting portion and the elastic retaining ring for the hole.

[0018] Furthermore, the second sealing assembly includes at least a second mounting portion, which is arranged on a side of the compression spring close to the outside; the second mounting portion includes a second bearing sleeved on the motor shaft, a second seal sleeved on the second bearing, and a bearing mounting sleeve in contact with the inner wall of the hollow shell, the second seal is installed in the bearing mounting sleeve, and the second mounting portion is used to close the gap between the motor shaft and the hollow shell.

[0019] Furthermore, the second sealing assembly also includes a second O-ring, which is sleeved on the second mounting portion and contacts the inner wall of the hollow shell.

[0020] Furthermore, the second sealing assembly also includes a wire-outlet retaining ring, which is sleeved on the motor shaft and arranged on a side of the compression spring close to the inside. The wire-outlet retaining ring is axially provided with a wire-discharging hole for discharging the cable of the DC motor.

[0021] Furthermore, the hollow shell includes an axially connected middle shell and a rear shell, the first sealing assembly is fixed to the middle shell, the second sealing assembly is fixed to the rear shell, and the rear shell and the middle shell are fixedly connected by screws.

[0022] Beneficial effects: The present application provides a rotary sealing structure for a DC hollow cup motor. By installing a DC hollow cup motor as the driving motor of a handle, the driving motor of the handle has the characteristics of small size, light weight, high motor efficiency and low energy consumption, and the motor torque of the DC hollow cup is small, which can ensure the efficiency of the motor. The DC hollow cup motor at least includes a DC motor and a hollow shell. The DC motor is axially arranged in the hollow shell. There is a gap between the motor shaft of the DC motor and the hollow shell. When running at high speed, it is inevitable that there will be movement, and external water stains and dust can easily enter the motor through the gap and corrode the motor. Therefore, a rotary sealing structure can be arranged between the DC motor and the hollow shell to close the gap between the DC motor and the hollow shell and maintain the sealing performance of the DC motor. Since the DC motor is arranged axially, there are gaps between its two ends and the hollow shell. Therefore, the rotary sealing structure includes a first sealing component and a second sealing component respectively fixed at both ends of the hollow shell, and the first sealing component and the second sealing component gather toward the motor shaft of the DC motor and are sleeved on the motor shaft, so that the first sealing component and the second sealing component form a closed sealing structure, blocking the gap between the DC motor and the hollow shell, ensuring that external water stains and dust cannot enter the DC motor, and the motor shaft is inserted in the first sealing component and the second sealing component, and when the motor shaft rotates at high speed, its radial displacement is limited, ensuring the stability of the DC motor when working; the first sealing component at least includes a cylindrical pin inserted into the DC motor along the axial direction, and the surface of the cylindrical pin contacts the hollow shell. When the DC motor rotates and there is a tendency of axial movement, the friction between the cylindrical pin and the hollow shell will limit the axial movement of the DC motor, further ensuring the stability of the operation of the DC motor. Therefore, the rotary sealing structure of the DC hollow cup motor has the beneficial effect of ensuring the stable operation of the DC motor while ensuring the sealing of the DC motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 An exploded view of a rotary seal structure of a DC coreless motor provided in the present application.

[0024] Figure 2A cross-sectional view of a rotary seal structure of a DC coreless motor provided in the present application.

[0025] Figure 3 A cross-sectional view of a first sealing assembly provided in the present application.

[0026] Figure 4 A cross-sectional view of a second sealing assembly provided in the present application.

[0027] In the figure: 1. elastic retaining ring for hole; 2. gasket; 3. first sealing member; 4. first bearing; 5. mounting member; 6. first O-ring; 7. middle shell; 8. cylindrical pin; 9. outlet retaining ring; 10. compression spring; 11. second bearing; 12. second sealing member; 13. bearing mounting sleeve; 14. second O-ring; 15. rear shell; 16. third O-ring; 17. screw; 18. DC motor. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application usually described and marked in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] The current rotary sealing structure of the DC motor in the minimally invasive intracavitary planing operation handle has poor precision and cannot achieve the problem of stabilizing the operation of the DC motor while ensuring its sealing performance. In order to solve this problem, the present application proposes a rotary sealing structure of a DC hollow cup motor.

[0031] Please refer to Figures 1 to 4 A rotary sealing structure of a DC hollow cup motor, the DC hollow cup motor at least comprises a DC motor 18 and a hollow shell, the DC motor 18 is axially arranged in the hollow shell, and the rotary sealing structure is arranged between the DC motor 18 and the hollow shell to maintain the sealing performance of the DC motor 18, comprising:

[0032] A first sealing component and a second sealing component are respectively fixed at both ends of the hollow housing; the first sealing component and the second sealing component are gathered toward the motor shaft of the DC motor 18 and are sleeved on the motor shaft to close the gap between the motor shaft and the hollow housing;

[0033] The first sealing assembly at least includes a cylindrical pin 8 inserted into the DC motor 18 along the axial direction, and the surface of the cylindrical pin 8 contacts the hollow housing to limit the axial movement of the DC motor 18.

[0034] Among them, in actual applications, the DC hollow cup motor has the advantages of small size, light weight, high motor efficiency, low energy consumption and small torque of the DC motor 18. The DC hollow cup motor is selected as the driving motor of the minimally invasive intracavitary planing operating handle to replace the ordinary driving motor in the minimally invasive intracavitary planing operating handle on the market, which can ensure the use efficiency of the DC motor 18.

[0035] Among them, in actual application, the DC hollow cup motor is used in the minimally invasive intracavitary planing operation handle to drive the planing knife to run at high speed to perform surgery to remove the lesion tissue. When the surgical flushing fluid flushes the handle, the external water stains can easily enter the DC motor 18 along the gap of the handle shell and corrode the motor. The sealing structure in the prior art usually only protects the motor by setting a threaded shell that is tightened. In actual use, its sealing effect is limited and cannot fully play a protective role. Therefore, a rotating sealing structure can be set between the DC motor 18 and the hollow shell to maintain the sealing performance of the DC motor 18, wherein the hollow shell is set in the handle shell, and the hollow shell has a cavity connected in the axial direction, and the DC motor 18 is placed in the cavity along the axial direction, and the outer hollow shell can protect the DC motor 18. The rotating sealing structure is set between the DC motor 18 and the hollow shell, closing the gap between the DC motor 18 and the hollow shell to ensure the sealing performance of the DC motor 18.

[0036] In practical applications, please refer to Figure 3 Since the motor shaft diameter in the DC motor 18 is relatively small, when it is set in a hollow shell, there is a gap between the two ends and the inner wall of the hollow shell. Therefore, in order to close the gap, the rotary sealing structure includes a first sealing component and a second sealing component respectively fixed at the two ends of the hollow shell. The first sealing component and the second sealing component are gathered toward the motor shaft of the DC motor 18 and are sleeved on the motor shaft, so that the motor shaft rotates in the first sealing component and the second sealing component, thereby improving the sealing performance of the DC motor 18.

[0037] Among them, in actual application, the first sealing component at least includes a cylindrical pin 8 inserted axially into the DC motor 18, and the surface of the cylindrical pin 8 is in contact with the hollow shell. When the motor shaft rotates and generates an axial running trend, the friction between the cylindrical pin 8 and the hollow shell can limit the axial movement of the DC motor 18, thereby improving the operating stability of the DC motor 18.

[0038] Furthermore, the second sealing assembly at least includes a compression spring 10 arranged along the axial direction, and the compression spring 10 is sleeved on the motor shaft to limit the axial movement of the DC motor 18.

[0039] In practical applications, please refer to Figure 4 The second sealing component at least includes a compression spring 10 arranged along the axial direction. The compression spring 10 is sleeved on the motor shaft and cooperates with the cylindrical pin 8. When the DC motor 18 moves axially, the compression spring 10 can limit the displacement of the DC motor 18 in the axial direction through its own elastic force, thereby further improving the stability of the operation of the DC motor 18.

[0040] Furthermore, the first sealing assembly also includes a hole elastic retaining ring with a diameter larger than the inner diameter of the hollow shell. The hole elastic retaining ring 1 is sleeved on the motor shaft to limit the rotational displacement of the DC motor 18.

[0041] In practical applications, please refer to Figure 3 The first sealing component also includes a hole elastic retaining ring 1 with a diameter larger than the inner diameter of the hollow shell, wherein the inner diameter of the hollow shell is the cavity diameter of the DC motor 18. The hole elastic retaining ring 1 is compressed and pressed into the hollow shell, and has a radial expansion force. After being sleeved on the motor shaft, when the DC motor 18 starts to rotate with a large torque, it can limit the overall rotation of the DC motor 18, thereby preventing the DC motor 18 from pulling the cable and affecting the operation of the minimally invasive intracavitary planing operating handle.

[0042] Furthermore, the first sealing assembly also includes a first sealing mounting portion, which includes a first bearing 4 sleeved on the motor shaft, a first sealing member 3 sleeved on the first bearing 4, and a mounting member 5 in contact with the inner wall of the hollow shell, the first sealing member 3 is installed in the mounting member 5, and the first sealing mounting portion is used to close the gap between the motor shaft and the hollow shell.

[0043] Among them, in the specific structure, the first sealing assembly also includes a first sealing installation part, which is used to sleeve the motor shaft and contact the inner wall of the hollow shell to close the gap between the motor shaft and the hollow shell. Specifically, the first sealing installation part includes a first bearing 4 sleeved on the motor shaft, the first bearing 4 is made of metal material, the motor shaft rotates in the first bearing 4, and can rotate better to avoid contact with the rubber part in the first sealing installation part, which affects the rotation of the motor shaft; a first sealing member 3 is sleeved on the first bearing 4, and the first sealing member 3 is a ring made of rubber, which is coated on the first bearing 4 to prevent water stains or dust from falling on the first bearing 4 made of metal material to corrode the first bearing 4, thereby avoiding corrosion and damage to the DC motor 18 and improving the sealing of the DC motor 18; wherein the first sealing member 3 is installed in the installation member 5, the installation member 5 is a through cylindrical shape, and the installation member 5 contacts the inner wall of the hollow shell to further close the gap between the motor shaft and the hollow shell and improve the sealing of the DC motor 18.

[0044] Furthermore, the first sealing assembly also includes a first O-ring 6, which is sleeved on the first sealing mounting portion and contacts the inner wall of the hollow shell.

[0045] In practical applications, the first sealing member 3 further includes a first O-ring 6, which can be made of rubber and sleeved on the first sealing mounting portion and in contact with the inner wall of the hollow housing, so as to better prevent external moisture from entering the DC motor 18 and improve the sealing performance of the DC motor 18. In order to facilitate the contact between the first O-ring 6 and the inner wall of the hollow housing, a first mounting groove matching the first O-ring 6 is provided on the inner wall of the hollow housing.

[0046] Furthermore, the first sealing assembly also includes a gasket 2, which is arranged between the first sealing mounting portion and the elastic retaining ring 1 for the hole, and is used to seal the gap between the first sealing mounting portion and the elastic retaining ring 1 for the hole.

[0047] Among them, in actual application, the first sealing component also includes a gasket 2, which is arranged between the first sealing mounting part and the elastic retaining ring 1 for the hole, and is close to the first sealing mounting part. On the one hand, it can seal the gap between the first sealing mounting part and the elastic retaining ring 1 for the hole. On the other hand, since the through hole in the elastic retaining ring 1 for the hole is large in size, a large gap will be left when the motor shaft passes through it. In order to prevent water stains from entering the DC motor 18 through the elastic retaining ring 1 for the hole, a gasket 2 can be arranged between the first sealing mounting part and the elastic retaining ring 1 for the hole to avoid this problem.

[0048] Furthermore, the second sealing assembly includes at least a second mounting portion, which is arranged on the side of the compression spring 10 close to the outside; the second mounting portion includes a second bearing 11 sleeved on the motor shaft, a second seal 12 sleeved on the second bearing 11, and a bearing mounting sleeve 13 in contact with the inner wall of the hollow shell, the second seal 12 is installed in the bearing mounting sleeve 13, and the second mounting portion is used to close the gap between the motor shaft and the hollow shell.

[0049] In practical applications, please refer to Figure 4 The second sealing assembly at least includes a second mounting portion, which is arranged on a side of the compression spring 10 close to the outside, and can limit the compression spring 10. The second mounting portion includes a second bearing 11 sleeved on the motor shaft. The second bearing 11 is made of a metal material, which is convenient for the motor shaft to rotate therein. A second sealing member 12 is sleeved on the second bearing 11. The second sealing member 12 is made of a rubber material and is coated on the second bearing 11 to prevent water stains or dust from falling on the second bearing 11 and corroding the second bearing 11. The second sealing member 12 is installed in a bearing mounting sleeve 13. The bearing mounting sleeve 13 is a through cylinder, and its surface contacts the inner wall of the hollow shell, which is used to close the gap between the motor shaft and the hollow shell to improve the sealing performance of the DC motor 18.

[0050] Furthermore, the second sealing assembly also includes a second O-ring 14, which is sleeved on the second mounting portion and contacts the inner wall of the hollow shell.

[0051] In practical applications, the second sealing assembly further includes a second O-ring 14, which is sleeved on the second mounting portion and made of rubber material, and contacts the inner wall of the hollow housing, and can better prevent external water stains and dust from entering the DC motor 18, thereby improving the sealing performance of the DC motor 18. In order to facilitate the second O-ring 14 to contact the inside of the hollow housing, a second mounting groove matching the second O-ring 14 is provided on the inner wall of the hollow housing.

[0052] Furthermore, the second sealing assembly also includes a wire-out retaining ring 9, which is sleeved on the motor shaft and arranged on the side of the compression spring 10 close to the inside. The wire-out retaining ring 9 is axially provided with a wire-discharging hole for discharging the cables of the DC motor 18.

[0053] Among them, in actual application, the second sealing component also includes a wire outlet retaining ring 9, which is sleeved on the motor shaft to avoid interference with the rotation operation of the motor shaft. The wire outlet retaining ring 9 is arranged on the side of the compression spring 10 close to the inside, and is provided with a wire arrangement hole opened along the axial direction. The cable of the DC motor 18 is discharged from the wire arrangement hole, which can be welded more conveniently and is conducive to the organization of the cables, avoiding the cables from being entangled on the motor shaft after being connected to the DC motor 18, affecting the operation of the DC motor 18.

[0054] Furthermore, the hollow shell includes an axially connected middle shell 7 and a rear shell 15 , a first sealing assembly is fixed on the middle shell 7 , a second sealing assembly is fixed on the rear shell 15 , and the rear shell 15 and the middle shell 7 are fixedly connected by screws 17 .

[0055] Among them, in actual application, in order to facilitate the installation of the first sealing component and the second sealing component, the hollow shell includes an axially connected middle shell 7 and a rear shell 15, the first sealing component is fixed on the middle shell 7, and the second sealing component is fixed on the rear shell 15. When assembling the DC motor 18, the first sealing component is first fixed into the middle shell 7, and then one end of the motor shaft of the DC motor 18 is inserted into the first sealing component, and then the second sealing component is fixed into the rear shell 15, and finally the rear shell 15 is connected and fixed to the middle shell 7, so that the other end of the motor shaft is inserted into the second sealing component. Among them, the middle shell housing 7 and the rear shell housing 15 can be fixed by screws 17. Among them, in some preferred embodiments, in order to prevent water stains and dust from entering the DC motor 18 from the connection between the middle shell housing 7 and the rear shell housing 15, a third mounting groove is provided at the portion of the rear shell housing 15 connected to the middle shell housing 7, and a third O-ring 16 is installed in the third mounting groove. The third O-ring 16 is connected to the middle shell housing 7, thereby sealing the connection between the middle shell housing 7 and the rear shell housing 15, further improving the sealing of the DC motor 18. The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A rotary seal structure of a DC hollow cup motor, the DC hollow cup motor comprising at least a DC motor (18) and a hollow shell, wherein the DC motor (18) is axially arranged in the hollow shell, and characterized in that: The rotary sealing structure is arranged between the DC motor (18) and the hollow housing and is used to maintain the sealing performance of the DC motor (18), comprising: A first sealing component and a second sealing component are respectively fixed to two ends of the hollow housing; the first sealing component and the second sealing component are gathered toward the motor shaft of the DC motor (18) and sleeved on the motor shaft to close the gap between the motor shaft and the hollow housing; The first sealing assembly at least comprises a cylindrical pin (8) inserted into the DC motor (18) along the axial direction, and the surface of the cylindrical pin (8) contacts the hollow housing to limit the axial movement of the DC motor (18).

2. The rotary seal structure of a DC coreless motor according to claim 1, characterized in that: The second sealing assembly comprises at least a compression spring (10) arranged in the axial direction, wherein the compression spring (10) is sleeved on the motor shaft to limit the axial movement of the DC motor (18).

3. The rotary seal structure of a DC coreless motor according to claim 2, characterized in that: The first sealing assembly also includes a hole elastic retaining ring (1) having a diameter greater than the inner diameter of the hollow housing, the hole elastic retaining ring (1) being sleeved on the motor shaft and used to limit the rotational displacement of the DC motor (18).

4. The rotary seal structure of a DC coreless motor according to claim 3, characterized in that: The first sealing assembly also includes a first sealing installation portion, which includes a first bearing (4) sleeved on the motor shaft, a first sealing member (3) sleeved on the first bearing (4), and a mounting member (5) in contact with the inner wall of the hollow shell, the first sealing member (3) being mounted in the mounting member (5), and the first sealing installation portion being used to close the gap between the motor shaft and the hollow shell.

5. The rotary seal structure of a DC coreless motor according to claim 4, characterized in that: The first sealing assembly further comprises a first O-ring (6), wherein the first O-ring (6) is sleeved on the first sealing mounting portion and contacts the inner wall of the hollow shell.

6. The rotary seal structure of a DC coreless motor according to claim 5, characterized in that: The first sealing assembly further comprises a gasket (2), which is arranged between the first sealing mounting portion and the hole elastic retaining ring (1) and is used to seal the gap between the first sealing mounting portion and the hole elastic retaining ring (1).

7. The rotary seal structure of a DC coreless motor according to claim 2, characterized in that: The second sealing assembly at least comprises a second mounting portion, the second mounting portion being arranged on a side of the compression spring (10) close to the outside; the second mounting portion comprises a second bearing (11) sleeved on the motor shaft, a second sealing member (12) sleeved on the second bearing (11), and a bearing mounting sleeve (13) in contact with the inner wall of the hollow shell, the second sealing member (12) being mounted in the bearing mounting sleeve (13), and the second mounting portion being used to close a gap between the motor shaft and the hollow shell.

8. The rotary seal structure of a DC coreless motor according to claim 7, characterized in that: The second sealing assembly further comprises a second O-ring (14), wherein the second O-ring (14) is sleeved on the second mounting portion and contacts the inner wall of the hollow shell.

9. The rotary seal structure of a DC coreless motor according to claim 8, characterized in that: The second sealing assembly also includes a wire-outlet retaining ring (9), which is sleeved on the motor shaft and arranged on a side of the compression spring (10) close to the inside, and the wire-outlet retaining ring (9) is provided with a wire-discharging hole along the axial direction for discharging the wires of the DC motor (18).

10. The rotary seal structure of a DC coreless motor according to claim 1, characterized in that: The hollow shell comprises an axially connected middle shell (7) and a rear shell (15); the first sealing assembly is fixed to the middle shell (7); the second sealing assembly is fixed to the rear shell (15); and the rear shell (15) and the middle shell (7) are fixedly connected by screws (17).

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